A large diameter bridge plug and its setting method

Abstract

A bridge plug having a large drift diameter comprises: an upper joint (1), a central pipe (7), a guide shoe head (12), and a bridge plug assembly; the upper joint and the guide shoe head are annular, the upper joint fixedly sleeves an outer side of one end of the central pipe, the guide shoe head fixedly sleeves the outer side of the other end of the central pipe, the bridge plug assembly sleeves the outer side of a middle section of the central pipe and is located between the upper joint and the guide shoe head, an apparatus for fixedly connecting to a pull rod(16) sleeved within the bridge plug is disposed on the guide shoe head, a soluble sphere base is disposed at the end of the central pipe proximal to the upper joint, and the central pipe is a drillable metal unit. The present invention also relates to a setting method of the bridge plug having a large drift diameter. The bridge plug having the large drift diameter eliminates a drilling and grinding step of the bridge plug and avoids the problems of a long construction time period, a high operation cost, and a large construction risk caused by the drilling and grinding step, such that the bridge plug is easier to use and faster to construct.

Description

technical field [0001] The invention relates to the technical field of petroleum industry, in particular to a large-diameter bridge plug and a setting method thereof. Background technique [0002] In the field of petroleum industry, packers or bridge plugs are usually used to achieve isolation between layers and other processes. The role of bridge plugs is to seal layers of oil and gas wells. It has the characteristics of fewer construction procedures, accurate sealing positions, and large-scale fracturing. [0003] With the development of oil and gas fields and the continuous consumption of energy, unconventional oil and gas will become the direction of future oil and gas energy. Composite bridge plug multi-stage fracturing technology is currently the main technology used in the development of unconventional oil and gas such as shale gas reservoirs at home and abroad. This technology is widely used because of its simple tool string and less restrictions. After the drilling...

AI Technical Summary

Problems solved by technology

[0004] However, when the composite bridge plug is used later, in order to ensure the smooth flow of oil and gas, it is usually necessary to drill and grind the bridge plug as a whole to remove it. The drilling and grinding process takes a long time, and the circulation of drill cuttings is difficult. The cost is high, so it has relatively large limitations in the staged pressure stimulation of shale gas

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